Process of testing cement.



No. 642,978. Patented Fab. 6, I900.

L G HAASE PROCESS OF TESTING CEMENT.

(Application filed Oct. 17, 1898.)

(No Model.)

m CL S S E N W W INVENTOH A TTOHNE).

NI'IED STATES ATENT OFFICE.

LEO G. IIAASE, OF OAK PARK, ILLINOIS, ASSIGNOR TO THE E. 85 T. FAIR- BANKS & COMPANY, OF ST. JOHNSBURY, VERMONT.

PROCESS OF TESTING CEMENT.

SPECIFICATION forming part of Letters Patent No. 642,978, dated February 6, 1900.

Application filed October 17,1898. Serial No. 693,782. (No specimens.)

T0 (0 whom it natty concern.-

Be it known that I, LE0 G. HAASE, a citizen of the United States,r esiding at Oak Park, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Processes of Testing Cement, of which the following is a description, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The present invention relates to the art of testing cement.

The object of the invention is to provide an improved process by means of which more accurate results may be obtained in testing different grades and qualities of cement to obtain the comparative strengths, in which process the testing briquet is submitted to a crushing action instead of a pulling action.

Heretofore cement-testing briquets have been in the form of solid blocks which were placed in a testing-machine such as shown in patent to O. C. Miller, No. 313,607, dated March 10, 1885, and subjected to a pulling action or tensile strain. Much difficulty has been experienced in testing cement by this old process and form of briquet, owing to the fact that the briquet will not break evenly, but will frequently break beyond the center by reason of an abnormal lateral or twisting strain. By my improved process the results attained are uniform to a marked degree.

My invention consists in the process for testing cement hereinafter described and claimed.

In the accompanying drawings, Figure 1 represents a face View of one of my improved briquets, the doited lines showing the same after the application of the crushing action. Fig. 2 is a central transverse vertical section, and Fig. 3 is an outline of a testing-machine with an improved briquet in position therein.

The improved process consists in first forming the different specimens (varieties) of coment into ring briquets of a uniform standard section, size, and opening and afterward subjecting them successively to accuratelymeasured crushing force in the direction of their diameters.

In the drawings, A represents the improved briquet as a whole, and the preferred form is that of the cross-secti0n of a cylinder or tube about three inches in diameter, the wall a of which is one inch wide and one inch thick. By this construction and by using a suitable form of compression-clamp, such as shown in the drawings, when the clamp-jaws are forced together the annular briquet will be broken at four points, thus breaking into four square inches, as shown in dotted lines, or, if desired, it may be broken at only two diametrically opposite points. In any event the breaking will be uniform, as experiment has proven.

In testing cement by tensile strain upon the solid briquet, or that commonly called the standard, the recorded variations in briquets made from the same lot of cement ran as high as one hundred pounds. A series of eight tests of cement by my process and annular briquet gave the following resultsviz. four hundred and eighty-four, four hundred and seventy, four hundred and seventy-two, four hundred and ninety-one, four hundred and seventy, four hundred and sixty-six, four hundred and seventy-three, and four hundred and seventy pounds, respectively, which clearly shows what uniform results are attained thereby, and the briquets used in these tests were not especially selected for the purpose.

I do not herein claim my improved briquet, as that forms the subject-matter of a separate application, a division of this, filed on the 29th day of November, 1899, Serial No. 7 38,67 5.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

The herein-described process of determining the comparative strength of different cements, which consists in first forming specimens thereof into ring briquets of some uniform standard section, size and opening, and then subjecting said briquets successively to accu rately-measured crushing force in the direction of their diameters.

In testimony whereof I affix my signature in presence of two witnesses.

LEO. G. HAASE.

Witnesses:

F. A. BERRY, T. N. BROWN. 

